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부산시내 지하생활권의 공기오염도와 온열인자에 관한 조사연구
최성용,문덕환,이종태,송인혁,이채언,이승민,Choi, Sung-Yong,Moon, Deog-Hwan,Lee, Jong-Tae,Song, In-Hyuk,Lee, Cha-Eun,Lee, Sung-Min 대한예방의학회 1994 Journal of Preventive Medicine and Public Health Vol.27 No.3
For the purpose of preparing the fundamental data on air pollution in underground shopping center and also contributing to the health improvement of residents, the authors measured the level of $SO_2,\;NO_2,\;TSP,\;CO,\;CO_2$ and also some related factors as air temperature, air movement, relative humidity and mean radiation temperature at inside and outside of underground shopping center in Pusan from January to February and from July to August 1994. The results were as follows : 1. The mean concentration of CO within the underground shopping center was $3.1{\pm}1.3ppm$ in winter and $2.1{\pm}0.9ppm$ in summer. There was a negative correlation (p<0.01) between inner CO concentration and temperature in summer and no correlation between inner CO concentration and outer CO concentration in underground shopping center 2. The mean concentration of COE within the underground shopping center was $876{\pm}353ppm$ in winter and $757{\pm}125ppm$ in summer. There was a negative correlation (p<0.01) between inner $CO_2$ concentration and air movement in summer and positive correlation (p<0.05) between inner $CO_2$ concentration and outer $CO_2$ concentration in underground shopping center. 3. The mean concentration of $SO_2$ within a underground shopping center was $0.036{\pm}0.019ppm$ in winter and $0.040{\pm}0.013ppm$ in summer. There was a positive correlation(p<0.01) between inner $SO_2$ concentration and temperature in summer and positive correlation between inner $SO_2$ concentration and outer $SO_2$ concentration in summer and winter in underground shopping center. 4. The mean concentration of $NO_2$ within a underground shopping center was $0.052{\pm}0.038ppm$ in winter and $0.042{\pm}0.016ppm$ in summer. There was a no correlation between inner $SO_2$ concentration and thermal factors in summer and winter and low correlation between inner $SO_2$ concentration and outer $SO_2$ concentration in underground shopping center 5. The mean concentration of TSP within a underground shopping center was $430{\pm}214{\mu}g/m^3$ in winter, $366{\pm}73{\mu}g/m^3$ in summer, and very in excess of the atmospheric environmental quality standards of Korea ($150{\mu}g/m3{\downarrow}$). There was low correlation between inner TSP concentration and temperature in summer and high correlation between inner TSP concentration and outer TSP concentration in underground shopping center.
혼화재료의 치환에 따른 경량기포 콘크리트의 기초적 특성분석
최성용,신재경,정광복,한민철,한천구,Choi, Sung-Yong,Shin, Jae-Kyung,Jeong, Kwang-Bok,Han, Min-Cheol,Han, Cheon-Goo 한국건축시공학회 2007 한국건축시공학회지 Vol.7 No.2
This study investigated the fundamental properties of the lightweight foamed concrete depending on various admixtures, and the results were summarized as following. When 20% of cement kiln dust(CKD) and 0.002% of stabilizing agent were mixed to lightweight foamed concrete, it was necessary to use a superplasticizer because flowability was decreased. However, it could reduce sinking depth which were the extensive trouble of lightweight foamed concrete. Bulk density was divided into '0.4' and '0.5' grades on KS according to unit volume weight. The compressive strength was less than that of plain concrete when admixtures were applied, but the results exceeded the minimum strength of the each grades on KS. Totally, it is found that the combination of 20% of CKD and 0.002% of stabilizing agent makes it possible to reduce a sinking depth, recycle resources, and save cost when were mixed.
한방의료기관에서 치료하는 환자의 의료이용분석 -외래 및 재원입원환자의 성, 연령, 지역별 분석을 중심으로-
최성용,신현규,박해모,이선동,Choi, Sung-Yong,Shin, Hyun-Kyu,Park, Hae-Mo,Lee, Sun-Dong 대한예방한의학회 2012 대한예방한의학회지 Vol.16 No.2
Objective : This study aimed to analyze the utilization of Korean Medicine clinics, and high-frequent diseases by sex, age, and region of outpatients and inpatients Methods : The data for this study were "Report on Usage Patterns of Korean Medicine Clinics" issued by the Ministry of Health and Welfare in 2008. Descriptive analysis and correspondence analysis were used to find the patterns of patient's utilization by sex, age and region Results : Diagnosis and examination methods mostly consisted of the pulse for diagnosis. Treatment methods consisted of acupuncture, medical herbs in package, and insurance extract powder. Fee for consultation was paid by Korean Medicine insurance. Usage increased when people's age was over 20 and climaxed among people who were in their 40s and 50s and decreased gradually afterwards. Also, there were differences between the sexes. There were differences in high-frequent diseases by regions, and in usage of Korean Medicine clinics according to sex and age. Conclusion : It was found that there were differences in usage and patterns of Korean Medicine Clinics according to sex, age, and region.
센서 네트워크에서의 위치 정보를 이용한 계층 구조 방식의 키 관리 기법
최성용 ( Sung-yong Choi ),송주석 ( Joo-seok Song ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.1
센서 네트워크는 수많은 센서 노드들로 구성되는 네트워크이다. 각 센서 노드는 배치된 환경에서 정보를 수집하여 전송하는 동작을 한다. 하지만 정보 전송 시에 공격자에게 노출되어 정보가 공격당할 우려가 있기 때문에 안전한 통신을 위해서 키 관리 기법이 필요하다. 그러나 센서 노드의 특징인 제한적인 자원을 가지고 있다는 점 때문에 공개키 알고리즘을 적용하기 어렵고 또한 다른 키 관리 기법에도 제약 조건이 따른다. 이러한 센서 네트워크의 특징을 고려하여 기존에 연구된 키 관리 기법들을 보완할 효율적이고 안전한 키 관리 기법을 제안하고자 한다.
초속경 라텍스개질 콘크리트로 보강된 RC보의 비선형 휨해석
최성용(Choi, Sung-Yong),윤경구(Lee, Bong-Hak),김용빈(Kim, Yong-Bin),강문식(Kang, Mun-Sik) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.11
라텍스로 개질된 콘크리트는 높은 휨강도 뿐만아니라 부착강도 및 투수저항성이 좋은 재료특성을 제공한다. 이러한 이점을 활용한 초속경 라텍스개질 콘크리트(VES-LMC)에 관련된 연구결과는 재료에 관한 것이 대부분으로, VES-LMC로 덧씌우기 보강된 RC 보의 부착 경계면 거동특성에 대한 체계적인 연구는 미진하다. 따라서 본 논문에서 는 VES-LMC로 보강된 철근콘크리트 보의 비선형 휨 거동에 대한 특성을 알아보고자 ABAQUS를 매개변수 연구를 수행한 결과 다음과 같은 결과를 얻을 수 있었다. 비선형 휨 해석을 위하여 본 논문에 적용된 모델의 적합성 여부를 확인한 결과 실험값과 비교적 유사한 경향을 보이는 것을 확인 할 수 있었다. 두께가 증가함에 따라 최대 저항강도가 증가하는 경향을 보여주었으며, 또한 강성 이 증가하여 내하력이 증진되는 결과를 확인할 수 있었다. 부착강도를 변 수로 해석한 결과, 전단강도가 증가함에 따라 휨 저항능력이 향상되는 결과를 확인 하였으며, 두 이질재료의 부착능 력이 구조물의 내하력에 지배적인 인자로 작용하는 것을 알 수 있었다. Latex modification of concrete provides the material with higher flexural strength, as well as high bond strength and reduced water permeability. One of the most advantages of the very early-strength latex-modified concrete (VES-LMC) could be the similar contraction and expansion behaviour to normal concrete substrate, which enable to ensure long-term performance. The purpose of this study was to parametric nonlinear flexural nonlinear analysis of RC beam rehabilitated by VES-LMC. The results were as follows; The flexural nonlinear analysis model of RC beam overlaid by VES-LMC in ABAQUS was proposed to predict the load-deflection response, interfacial stress, and ultimate strength. The proposed FE analysis model was verified by comparison of an experimental data and the FE analysis results. The FE analysis results showed that yield point as well as flexural stiffness increased as the depth increased; the stiffness of beam overall increased as the bond stiffness became larger; the bond strength between two different materials is a key factor in composite beam. A parametric study showed that an overlay thickness was a main influencing factor to the behavior of RC beam overlaid by VES-LMC.